could i use a select?

Hi,
I've an Invoice Model:

class Invoice(models.Model):
...
number = models.IntegerField(...)
customer = models.ForeignKey()
date_invoice = ...
total_invoice = ...
...

To have the top ten customer can i do?
I have to use a select:

SELECT SUM(total_invoice) AS total FROM invoice_invoice GROUP BY
customer ORDER BY total DESC

or can I use django methods? How?

Thanks,
Vittorino.

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